showDialog requestFeature() must be called before adding content
出现此问题是由于dialog.show()之前调用了dialog.setContentView()或者dialog.getwindow()等，正确的应该是dialog.show()之后调用dialog.setContentView()
dataPickerDialog.show() //要放最前面 dataPickerDialog.changeTitleStyle() dataPickerDialog.changeDividerColor()